Edit MattK: The reason they do not work is that material parameter collections are updated inside of a uworld that slate doesnt have access to. We just need to figure out a way to update the necessary parameter collections elsewhere.

Steps to Reproduce

Create a MaterialParameterCollection. Have it driven by the level blueprint. Wire as an input to a material driving a Slate UI object's Material. In 4.14, this would not work. Now it should. It also should work for RetainerBoxes.

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ComponentUE - Editor - UI Systems
Target Fix4.15
Fix Commit3192365
Main Commit3229477
CreatedJul 22, 2015
ResolvedNov 9, 2016
UpdatedApr 11, 2019